Override Members: Allow overriding virtual synthetic members (e.g. equals(), hashCode(), toString(), etc.) in data classes

#KT-15563 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMembersHandler.kt

@@ -27,8 +27,7 @@ class OverrideMembersHandler(private val preferConstructorParameters: Boolean =
     override fun collectMembersToGenerate(descriptor: ClassDescriptor, project: Project): Collection<OverrideMemberChooserObject> {
         val result = ArrayList<OverrideMemberChooserObject>()
         for (member in descriptor.unsubstitutedMemberScope.getContributedDescriptors()) {
-            if (member is CallableMemberDescriptor
-                && (member.kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE || member.kind == CallableMemberDescriptor.Kind.DELEGATION)) {
+            if (member is CallableMemberDescriptor && (member.kind != CallableMemberDescriptor.Kind.DECLARATION)) {
                 val overridden = member.overriddenDescriptors
                 if (overridden.any { it.modality == Modality.FINAL || Visibilities.isPrivate(it.visibility.normalize()) }) continue
 
@@ -52,7 +51,7 @@ class OverrideMembersHandler(private val preferConstructorParameters: Boolean =
                     nonAbstractRealSupers
                 }
                 else {
-                    listOf(realSupers.first())
+                    listOf(realSupers.firstOrNull() ?: continue)
                 }
 
                 for (realSuper in realSupersToUse) {